- Machine Shop, Altoona
- Machine Shop & Tool Repair Service, Altoona
- Machine Tools , Altoona
- Machinery And Equipment Manufacturers, Altoona
- Machinery, Supplies & Equipment - Business Production Related, Altoona
- Machinery, Supplies & Equipment - Business Supplies Related, Altoona
- Machinery, Supplies & Equipment - Construction & Contractor Related, Altoona
- Mail Delivery Service, Altoona
- Mailbox Rental Services, Altoona
- Mailing, Delivery & Courier Service, Altoona
- Major Appliances, Altoona - Household & Kitchen
- Malls & Shopping Centers, Altoona
- Malpractice Attorneys & Lawyers, Altoona
- Malpractice Lawyers & Attorneys, Altoona
- Management Consultants & Services, Altoona
- Manicurists & Pedicurists, Altoona
- Manifold Business Forms Manufacturers, Altoona
- Manufacturing, Altoona
- Manufacturing Products, Altoona
- Marine Supplies & Equipment, Altoona - Boat Supplies
- Marketing Schools, Altoona
- Marriage & Family Counselors, Altoona
- Marriage & Family Counselors Information & Referrals, Altoona
- Martial Arts & Self Defense Schools, Altoona
- Masonry Contractors, Altoona - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Altoona
- Massage Therapists & Professional, Altoona
- Massage Therapy, Altoona
- Mastectomy Apparel, Forms, Prostheses & Supplies, Altoona
- Material Handling & Heavy Machinery & Equipment, Altoona
- Maternity Clothes & Clothing Stores, Altoona - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Altoona
- Mausoleums Developers, Altoona
- Meat Market, Wholesale & Products, Altoona
- Mechanical Contractors, Altoona - Install, Service & Repair
- Medical & Dental Assistant Schools, Altoona
- Medical & Dental Management, Altoona
- Medical & Health Service Organizations, Altoona
- Medical Billing Services, Altoona
- Medical Groups & Clinics, Altoona - Medical & Health Centers
- Medical Supplies & Equipment, Altoona
- Meeting & Event Planning Services, Altoona - Conference Consultants
- Membership Sports & Recreation Clubs, Altoona
- Men's & Boys Clothing & Accessories Stores, Altoona
- Men's Clothing Stores, Altoona - Clothes & Accessories
- Men's Shoe Stores, Altoona
- Mental & Developmental Information & Referral Services, Altoona
- Mental Health Clinics, Altoona - Treatment Centers
- Mental Health Specialists, Altoona - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Altoona
- Metal Goods Alloys, Altoona
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- Metal Repair Service & Blacksmith, Altoona - Iron Works
- Metal Specialties, Altoona
- Metals Base, Altoona
- Metaphysical Churches, Altoona
- Methodist Church, Altoona
- Mexican Restaurants, Altoona
- Mini & Self Storage, Altoona
- Mining, Altoona
- Mining Contractors, Altoona - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Altoona - Mining Companies
- Ministries Church, Altoona
- Miscellaneous Business Credit Institutions & Services, Altoona
- Miscellaneous Household Item Repair, Altoona
- Miscellaneous Prosthesis & Appliances, Altoona
- Miscellaneous Business Services, Altoona
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Altoona
- Miscellaneous Government, Altoona
- Miscellaneous Industry, Altoona
- Miscellaneous Manufacturing, Altoona
- Miscellaneous Personal Services, Altoona
- Miscellaneous Photographers, Altoona
- Miscellaneous Professional, Altoona
- Mobile Home Parks & Communities , Altoona
- Model Trains, Altoona
- Modular & Mobile Homes For Sale, Altoona - Manufactured Homes Sale & Service
- Money Transfer Service, Altoona
- Monuments, Tombstones, Markers & Memorials, Altoona
- Mortgage Bankers & Correspondents, Altoona
- Mortgage Companies, Altoona
- Mortgage Contracts & Services, Altoona
- Mortgages & Loans, Altoona
- Motion Picture & Television Production Services, Altoona
- Motor Vehicle, Altoona
- Motor Vehicle Rental & Leasing, Altoona
- Motorcycle & Motor Scooters Dealers, Repair & Service, Altoona
- Motorcycle Parts, Accessories & Dealers, Altoona
- Motorcycle Repair & Service, Altoona
- Movie Theaters, Altoona
- Moving & Storage Supplies & Equipment, Altoona
- Moving Companies, Altoona
- Moving Supplies & Equipment Rental, Altoona
- Moving Truck Rental , Altoona
- Muffler Shop & Exhaust Systems, Altoona
- Multimedia Publishers, Altoona - Multimedia Services & Systems
- Museums, Altoona
- Music, Altoona
- Music Entertainment, Altoona
- Musical Instruments & Equipment Stores, Altoona
- Musical Instruments Repair, Sales & Service, Altoona
- Musical Recording Services, Altoona
- Muslim Church, Altoona
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